(in literature and art) a relation of all the parts or elements of a work constituting a harmonious whole and producing a single general effect.

8.

one of the three principles of dramatic structure (the three unities) derived from Aristotelian aesthetics and formalized in the neoclassic canon in which a play is required to represent action as taking place in one day (unity of time) as occurring within one place (unity of place) and as having a single plot with a beginning, middle, and end (unity of action)

mutual agreement; harmony or concord: the participants were no longer in unity

5.

uniformity or constancy: unity of purpose

6.

(maths)

the number or numeral one

a quantity assuming the value of one: the area of the triangle was regarded as unity

the element of a set producing no change in a number following multiplication

7.

the arrangement of the elements in a work of art in accordance with a single overall design or purpose

8.

any one of the three principles of dramatic structure deriving from Aristotle's Poetics by which the action of a play should be limited to a single plot (unity of action), a single location (unity of place), and the events of a single day (unity of time)